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Use in-memory LRU cache in CDX Server dedup

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Add option `--cdxserver-dedup-lru-cache-size=N` (default None) to enable
in-memory caching of CDX dedup requests using stdlib `lru_cache` method.

Cache memory info is available on `INFO` logging outputs like:
```
CacheInfo(hits=3172, misses=3293, maxsize=1024, currsize=1024)
``
This commit is contained in:
Vangelis Banos 2019-02-07 09:08:11 +00:00
parent 98f50ca296
commit 53f13d3536
2 changed files with 13 additions and 1 deletions
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10
warcprox/dedup.py
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@ -34,6 +34,7 @@ import urllib3
from urllib3.exceptions import HTTPError
import collections
from concurrent import futures
from functools import lru_cache
urllib3.disable_warnings()
@ -236,6 +237,8 @@ class CdxServerDedup(DedupDb):
headers['Cookie'] = options.cdxserver_dedup_cookies
self.http_pool = urllib3.PoolManager(maxsize=maxsize, retries=0,
timeout=2.0, headers=headers)
if options.cdxserver_dedup_lru_cache_size:
self.cached_lookup = lru_cache(maxsize=options.cdxserver_dedup_lru_cache_size)(self.lookup)
def loader(self, *args, **kwargs):
return CdxServerDedupLoader(self, self.options)
@ -299,6 +302,7 @@ class CdxServerDedupLoader(warcprox.BaseBatchPostfetchProcessor, DedupableMixin)
self.pool = futures.ThreadPoolExecutor(max_workers=options.cdxserver_dedup_max_threads)
self.batch = set()
self.cdx_dedup = cdx_dedup
self.use_lru_cache = options.cdxserver_dedup_lru_cache_size != None
def _get_process_put(self):
recorded_url = self.inq.get(block=True, timeout=0.5)
@ -315,7 +319,11 @@ class CdxServerDedupLoader(warcprox.BaseBatchPostfetchProcessor, DedupableMixin)
try:
digest_key = warcprox.digest_str(recorded_url.payload_digest,
self.options.base32)
dedup_info = self.cdx_dedup.lookup(digest_key, recorded_url.url)
if self.use_lru_cache:
dedup_info = self.cdx_dedup.cached_lookup(digest_key, recorded_url.url)
self.logger.info(self.cdx_dedup.cached_lookup.cache_info())
else:
dedup_info = self.cdx_dedup.lookup(digest_key, recorded_url.url)
if dedup_info:
recorded_url.dedup_info = dedup_info
except ValueError as exc:

4
warcprox/main.py
View File

@ -172,6 +172,10 @@ def _build_arg_parser(prog='warcprox', show_hidden=False):
'--cdxserver-dedup-max-threads', dest='cdxserver_dedup_max_threads',
type=int, default=50, help=suppress(
'maximum number of cdx server dedup threads'))
hidden.add_argument(
'--cdxserver-dedup-lru-cache-size', dest='cdxserver_dedup_lru_cache_size',
type=int, help=suppress(
'enable in-memory LRU cache to reduce duplicate CDX server requests'))
arg_parser.add_argument('--dedup-min-text-size', dest='dedup_min_text_size',
type=int, default=0,
help=('try to dedup text resources with payload size over this limit in bytes'))